Teko_StridedEpetraOperator.cpp

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//      Teko: A package for block and physics based preconditioning
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#include "Epetra/Teko_StridedEpetraOperator.hpp"
#include "Epetra/Teko_StridedMappingStrategy.hpp"
#include "Epetra/Teko_ReorderedMappingStrategy.hpp"

#include "Teuchos_VerboseObject.hpp"

#include "Thyra_LinearOpBase.hpp"
#include "Thyra_EpetraLinearOp.hpp"
#include "Thyra_EpetraThyraWrappers.hpp"
#include "Thyra_DefaultProductMultiVector.hpp"
#include "Thyra_DefaultProductVectorSpace.hpp"
#include "Thyra_DefaultBlockedLinearOp.hpp"
#include "Thyra_get_Epetra_Operator.hpp"

#include "Epetra_Vector.h"
#include "EpetraExt_MultiVectorOut.h"
#include "EpetraExt_RowMatrixOut.h"

#include "Teko_Utilities.hpp"

namespace Teko {
namespace Epetra {

using Teuchos::RCP;
using Teuchos::rcp;
using Teuchos::rcp_dynamic_cast;

StridedEpetraOperator::StridedEpetraOperator(int numVars,const Teuchos::RCP<const Epetra_Operator> & content,
                                             const std::string & label) 
      : Teko::Epetra::EpetraOperatorWrapper(), label_(label)
{
   std::vector<int> vars;
   
   // build vector describing the sub maps
   for(int i=0;i<numVars;i++) vars.push_back(1);

   SetContent(vars,content);
}

StridedEpetraOperator::StridedEpetraOperator(const std::vector<int> & vars,const Teuchos::RCP<const Epetra_Operator> & content,
                                             const std::string & label) 
      : Teko::Epetra::EpetraOperatorWrapper(), label_(label)
{
   SetContent(vars,content);
}

void StridedEpetraOperator::SetContent(const std::vector<int> & vars,const Teuchos::RCP<const Epetra_Operator> & content)
{ 
   fullContent_ = content;
   stridedMapping_ = rcp(new StridedMappingStrategy(vars,Teuchos::rcpFromRef(fullContent_->OperatorDomainMap()),
                                                         fullContent_->Comm()));
   SetMapStrategy(stridedMapping_);

   // build thyra operator
   BuildBlockedOperator(); 
}

void StridedEpetraOperator::BuildBlockedOperator()
{
   TEUCHOS_ASSERT(stridedMapping_!=Teuchos::null);

   // get a CRS matrix
   const RCP<const Epetra_CrsMatrix> crsContent = rcp_dynamic_cast<const Epetra_CrsMatrix>(fullContent_);

   // ask the strategy to build the Thyra operator for you
   if(stridedOperator_==Teuchos::null) {
      stridedOperator_ = stridedMapping_->buildBlockedThyraOp(crsContent,label_);
   }
   else {
      const RCP<Thyra::BlockedLinearOpBase<double> > blkOp = rcp_dynamic_cast<Thyra::BlockedLinearOpBase<double> >(stridedOperator_,true);
      stridedMapping_->rebuildBlockedThyraOp(crsContent,blkOp);
   }

   // set whatever is returned
   SetOperator(stridedOperator_,false);

   // reorder if neccessary
   if(reorderManager_!=Teuchos::null) 
      Reorder(*reorderManager_);
}

const Teuchos::RCP<const Epetra_Operator> StridedEpetraOperator::GetBlock(int i,int j) const
{
   const RCP<const Thyra::BlockedLinearOpBase<double> > blkOp 
         = Teuchos::rcp_dynamic_cast<const Thyra::BlockedLinearOpBase<double> >(getThyraOp());

   return Thyra::get_Epetra_Operator(*blkOp->getBlock(i,j));
}

void StridedEpetraOperator::Reorder(const BlockReorderManager & brm)
{
   reorderManager_ = rcp(new BlockReorderManager(brm));

   // build reordered objects
   RCP<const MappingStrategy> reorderMapping = rcp(new ReorderedMappingStrategy(*reorderManager_,stridedMapping_));
   RCP<const Thyra::BlockedLinearOpBase<double> > blockOp
         = rcp_dynamic_cast<const Thyra::BlockedLinearOpBase<double> >(stridedOperator_);

   RCP<const Thyra::LinearOpBase<double> > A = buildReorderedLinearOp(*reorderManager_,blockOp);

   // set them as working values
   SetMapStrategy(reorderMapping);
   SetOperator(A,false);
}

void StridedEpetraOperator::RemoveReording()
{
   SetMapStrategy(stridedMapping_);
   SetOperator(stridedOperator_,false);
   reorderManager_ = Teuchos::null;
}

void StridedEpetraOperator::WriteBlocks(const std::string & prefix) const
{
   RCP<Thyra::PhysicallyBlockedLinearOpBase<double> > blockOp
         = rcp_dynamic_cast<Thyra::PhysicallyBlockedLinearOpBase<double> >(stridedOperator_);

   // get size of strided block operator
   int rows = Teko::blockRowCount(blockOp);

   for(int i=0;i<rows;i++) {
      for(int j=0;j<rows;j++) {
         // build the file name
         std::stringstream ss;
         ss << prefix << "_" << i << j << ".mm";

         // get the row matrix object (Note: can't use "GetBlock" method b/c matrix might be reordered)
         RCP<const Epetra_RowMatrix> mat
               = Teuchos::rcp_dynamic_cast<const Epetra_RowMatrix>(Thyra::get_Epetra_Operator(*blockOp->getBlock(i,j)));

         // write to file
         EpetraExt::RowMatrixToMatrixMarketFile(ss.str().c_str(),*mat);
      }
   }
}

std::string StridedEpetraOperator::PrintNorm(const eNormType & nrmType,const char newline)
{
   BlockedLinearOp blockOp = toBlockedLinearOp(stridedOperator_);

   // get size of strided block operator
   int rowCount = Teko::blockRowCount(blockOp);
   int colCount = Teko::blockRowCount(blockOp);

   std::stringstream ss;
   ss.precision(4);
   ss << std::scientific;
   for(int row=0;row<rowCount;row++) {
      for(int col=0;col<colCount;col++) {
         // get the row matrix object (Note: can't use "GetBlock" method b/c matrix might be reordered)
         RCP<const Epetra_CrsMatrix> mat = Teuchos::rcp_dynamic_cast<const Epetra_CrsMatrix>(
               Thyra::get_Epetra_Operator(*blockOp->getBlock(row,col)));

         // compute the norm
         double norm = 0.0;
         switch(nrmType) {
         case Inf: 
            norm = mat->NormInf();
            break;
         case One: 
            norm = mat->NormOne();
            break;
         case Frobenius: 
            norm = mat->NormFrobenius();
            break;
         default:
            TEUCHOS_TEST_FOR_EXCEPTION(true,std::runtime_error,
                               "StridedEpetraOperator::eNormType incorrectly specified");
         }

         ss << norm << " "; 
      }
      ss << newline;
   }

   return ss.str();
}

bool StridedEpetraOperator::testAgainstFullOperator(int count,double tol) const
{
   Epetra_Vector xf(OperatorRangeMap());
   Epetra_Vector xs(OperatorRangeMap());
   Epetra_Vector y(OperatorDomainMap());

   // test operator many times
   bool result = true;
   double diffNorm=0.0,trueNorm=0.0;
   for(int i=0;i<count;i++) {
      xf.PutScalar(0.0);
      xs.PutScalar(0.0);
      y.Random();

      // apply operator
      Apply(y,xs); // xs = A*y
      fullContent_->Apply(y,xf); // xf = A*y

      // compute norms
      xs.Update(-1.0,xf,1.0);
      xs.Norm2(&diffNorm);
      xf.Norm2(&trueNorm);

      // check result
      result &= (diffNorm/trueNorm < tol);
   }

   return result;
}

} // end namespace Epetra
} // end namespace Teko